The invention relates to the structural improvement of a drainage tube, especially a drainage tube combined with a chest tube and a drainage bottle, wherein the front end of the drainage tube is provided with a threaded structure and a chest tube is screwed through a screw connecting pipe, and the drainage tube has the color corresponding to the drainage bottle, and the end is provided with a screw hole corresponding to the interface of the drainage bottle, so as to improve the correctness of the assembly and prevent accidents after the completion of the assembly. The divorced person.本創作係一種引流管之結構改良，尤指結合於胸管及引流瓶之間的引流管，其中該引流管的前端是具有螺紋結構經由螺接管而螺設胸管，復該引流管具有對應引流瓶之顏色，且於末端則是對應引流瓶接口設置螺孔，俾可提昇組接的正確性，並在完成組接後防止意外脫離者。
